Ethereum revolutionized blockchain technology by introducing smart contracts, allowing developers to build decentralized applications that automate processes without intermediaries. It serves as the foundation for the DeFi ecosystem, NFTs, and many blockchain-based solutions. The Ethereum Virtual Machine (EVM) enables cross-platform compatibility, making Ethereum a leading smart contract platform. Additionally, its transition to PoS enhances security and sustainability while maintaining decentralization. Secure Ethereum holdings using hardware wallets to prevent unauthorized access.